I am going to see what got my son asking the question. I'm curious
if it was used on one of his t.v. programs (he usually watches kids
channels only). or was it a piece of literature? The only b / w
movie we have watched lately was Casablanca.

I think I know what kind of movies this genre belongs too. DOA
sounds distinctly familiar. Perhaps we should rent one or two to
illustrate them for him.

However, he is suseptible to moods and perhaps the genre itself is
not quite appropriate to him. If the movie is too dark it may be
something to research first and explain the styling and plot. He
likes these discussions and I value them because they are so rare.